RE: Black horse super air C of G needed
Keith first I have no idea of what this airplane is but figuring out what a good CG position is a simple task but first a couple of questions about your airplane. First is this some sort of trainer or a low wing plane.
Now the most import question is what is the configuration of the wing, is it a rectangular board wing or a tapered wing, eliptical etc?
If you can describe the answer to these questions I can explain the very simple method called midspan averaging that requires no computer and can resolve these question easily and will be useful for years and all your models if you desire.
John